Camaro z28/ IROC-z questions


Asked by Jan 14, 2009 at 10:02 PM about the 1985 Chevrolet Camaro IROC-Z Coupe RWD

Question type: General

Whats the stock tire size and rim size for a 1985 camaro iroc-z and what is the gear ratio.

4 Answers

Four part reply... 1. 2. 245/50ZR16 3. 4. Don't forget your mullet!


As above 245/50/16 is correct if you got the 16 inch wheels. Otherwise put whatever you want on there. A 295 will fit without body mods. The gear ratio is one of three options: 3.23 for a carbureted auto trans car 3.73 for a carbed clutch car 3.42 for a TPI car with the optional G92 performance package. Even better is just to open up your diff and start counting teeth. There is not a third gen camaro yet alive that hasn't been molested in some way, and rear ends are very common. Once you know the gear ratio, and tire size you want to use, you can figure out which speedometer gears to swap without much trouble. Call the folks at Jags That Run if you have an auto. If you have a T5 manual... good luck.


David, I don't remember the Iroc coming with a 3:73 gears stock from the factory, what I do remember is that the Automatic Irocs Came with 3:23 and the 5 speed Iroc came with 3:42

735 great info here

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